{"id":"CVE-2021-46823","aliases":["AZL-9960","DEBIAN-CVE-2021-46823","EUVD-2022-6131","GHSA-qfr5-wjpw-q4c4","GHSA-r8wq-qrxc-hmcm","MGASA-2022-0310","OESA-2022-1792","OESA-2022-1809","PYSEC-2026-912","UBUNTU-CVE-2021-46823","USN-5508-1"],"status":"published","title":"Denial of Service in python-ldap","description":"python-ldap before 3.4.0 is vulnerable to a denial of service when ldap.schema is used for untrusted schema definitions, because of a regular expression denial of service (ReDoS) flaw in the LDAP schema parser. By sending crafted regex input, a remote authenticated attacker could exploit this vulnerability to cause a denial of service condition.","severity":{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","level":"medium","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-11","score":0.01974,"percentile":0.80711,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-1333"],"published":"2021-11-29T17:58:59Z","modified":"2026-10-23T18:05:16Z","fixes":[{"ecosystem":"PyPI","package":"python-ldap","fixed_in":["3.4.0"],"sources":["ghsa","osv"]},{"ecosystem":"Azure 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Linux:2","package":"python-ldap","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.4.0-1"}]}]},{"source":"osv","ecosystem":"Debian:12","package":"python-ldap","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.4.0-1"}]}]},{"source":"osv","ecosystem":"Debian:13","package":"python-ldap","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.4.0-1"}]}]},{"source":"osv","ecosystem":"Debian:14","package":"python-ldap","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.4.0-1"}]}]},{"source":"osv","ecosystem":"PyPI","package":"python-ldap","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.4.0"}]}],"versions":["2.3.13","2.4.0","2.4.1","2.4.10","2.4.12","2.4.13","2.4.14","2.4.15","2.4.16","2.4.17","2.4.18","2.4.19","2.4.2","2.4.20","2.4.21","2.4.22","2.4.25","2.4.26","2.4.27","2.4.28","2.4.29","2.4.3","2.4.30","2.4.31","2.4.32","2.4.33","2.4.35","2.4.36","2.4.37","2.4.38","2.4.39","2.4.4","2.4.40","2.4.41","2.4.42","2.4.43","2.4.44","2.4.45","2.4.5","2.4.6","2.4.7","2.4.8","2.4.9","2.5.1","2.5.2","3.0.0","3.0.0b1","3.0.0b2","3.0.0b3","3.0.0b4","3.1.0","3.2.0","3.3.0","3.3.1"]},{"source":"osv","ecosystem":"PyPI","package":"python-ldap","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.4.0"}]}],"versions":["2.3.13","2.4.0","2.4.1","2.4.10","2.4.12","2.4.13","2.4.14","2.4.15","2.4.16","2.4.17","2.4.18","2.4.19","2.4.2","2.4.20","2.4.21","2.4.22","2.4.25","2.4.26","2.4.27","2.4.28","2.4.29","2.4.3","2.4.30","2.4.31","2.4.32","2.4.33","2.4.35","2.4.36","2.4.37","2.4.38","2.4.39","2.4.4","2.4.40","2.4.41","2.4.42","2.4.43","2.4.44","2.4.45","2.4.5","2.4.6","2.4.7","2.4.8","2.4.9","2.5.1","2.5.2","3.0.0","3.0.0b1","3.0.0b2","3.0.0b3","3.0.0b4","3.1.0","3.2.0","3.3.0","3.3.1"]},{"source":"osv","ecosystem":"Mageia:8","package":"python-ldap","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.3.1-1.1.mga8"}]}]},{"source":"osv","ecosystem":"openEuler:20.03-LTS-SP1","package":"python-ldap","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.1.0-4.oe1"}]}]},{"source":"osv","ecosystem":"openEuler:22.03-LTS","package":"python-ldap","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.3.1-4.oe2203"}]}]},{"source":"osv","ecosystem":"openEuler:20.03-LTS-SP3","package":"python-ldap","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.1.0-4.oe1"}]}]},{"source":"osv","ecosystem":"PyPI","package":"python-ldap","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.4.0"}]}],"versions":["2.3.13","2.4.0","2.4.1","2.4.10","2.4.12","2.4.13","2.4.14","2.4.15","2.4.16","2.4.17","2.4.18","2.4.19","2.4.2","2.4.20","2.4.21","2.4.22","2.4.25","2.4.26","2.4.27","2.4.28","2.4.29","2.4.3","2.4.30","2.4.31","2.4.32","2.4.33","2.4.35","2.4.36","2.4.37","2.4.38","2.4.39","2.4.4","2.4.40","2.4.41","2.4.42","2.4.43","2.4.44","2.4.45","2.4.5","2.4.6","2.4.7","2.4.8","2.4.9","2.5.1","2.5.2","3.0.0","3.0.0b1","3.0.0b2","3.0.0b3","3.0.0b4","3.1.0","3.2.0","3.3.0","3.3.1"]},{"source":"osv","ecosystem":"Ubuntu:18.04:LTS","package":"python-ldap","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.0.0-1ubuntu0.2"}]}],"versions":["2.4.41-1","2.5.2-1","3.0.0~b4-1","3.0.0-1","3.0.0-1ubuntu0.1"]},{"source":"osv","ecosystem":"Ubuntu:20.04:LTS","package":"python-ldap","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.2.0-4ubuntu2.1"}]}],"versions":["3.1.0-2build1","3.1.0-2build2","3.2.0-3","3.2.0-3ubuntu1","3.2.0-3ubuntu2","3.2.0-3ubuntu3","3.2.0-4ubuntu2"]},{"source":"osv","ecosystem":"Ubuntu:22.04:LTS","package":"python-ldap","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.2.0-4ubuntu7.1"}]}],"versions":["3.2.0-4ubuntu5","3.2.0-4ubuntu6","3.2.0-4ubuntu7"]},{"source":"osv","ecosystem":"Ubuntu:18.04:LTS","package":"python-ldap","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.0.0-1ubuntu0.2"}]}],"versions":["2.4.41-1","2.5.2-1","3.0.0~b4-1","3.0.0-1","3.0.0-1ubuntu0.1"]},{"source":"osv","ecosystem":"Ubuntu:20.04:LTS","package":"python-ldap","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.2.0-4ubuntu2.1"}]}],"versions":["3.1.0-2build1","3.1.0-2build2","3.2.0-3","3.2.0-3ubuntu1","3.2.0-3ubuntu2","3.2.0-3ubuntu3","3.2.0-4ubuntu2"]},{"source":"osv","ecosystem":"Ubuntu:22.04:LTS","package":"python-ldap","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.2.0-4ubuntu7.1"}]}],"versions":["3.2.0-4ubuntu5","3.2.0-4ubuntu6","3.2.0-4ubuntu7"]}],"products":[{"vendor":"python-ldap","product":"python-ldap"}],"references":[{"url":"https://github.com/python-ldap/python-ldap/security/advisories/GHSA-r8wq-qrxc-hmcm","tags":["x_refsource_MISC","x_transferred","Third Party Advisory","advisory","web","report"]},{"url":"https://exchange.xforce.ibmcloud.com/vulnerabilities/221507","tags":["x_refsource_MISC","x_transferred","Third Party Advisory","VDB Entry","advisory","web","report"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-46823","tags":["web","advisory"]},{"url":"https://github.com/advisories/GHSA-qfr5-wjpw-q4c4","tags":["advisory"]},{"url":"https://github.com/python-ldap/python-ldap/issues/424","tags":["web"]},{"url":"https://github.com/advisories/GHSA-r8wq-qrxc-hmcm"},{"url":"https://security-tracker.debian.org/tracker/CVE-2021-46823","tags":["advisory"]},{"url":"https://github.com/python-ldap/python-ldap","tags":["package"]},{"url":"https://advisories.mageia.org/MGASA-2022-0310.html","tags":["advisory"]},{"url":"https://bugs.mageia.org/show_bug.cgi?id=30627","tags":["report"]},{"url":"https://ubuntu.com/security/notices/USN-5508-1","tags":["advisory"]},{"url":"https://www.openeuler.org/en/security/safety-bulletin/detail.html?id=openEuler-SA-2022-1792","tags":["advisory"]},{"url":"https://www.openeuler.org/en/security/safety-bulletin/detail.html?id=openEuler-SA-2022-1809","tags":["advisory"]},{"url":"https://pypi.org/project/python-ldap","tags":["package"]},{"url":"https://ubuntu.com/security/CVE-2021-46823","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2021-46823","tags":["report"]}],"sources":{"cve":[{"id":"CVE-2021-46823","description":"python-ldap before 3.4.0 is vulnerable to a denial of service when ldap.schema is used for untrusted schema definitions, because of a regular expression denial of service (ReDoS) flaw in the LDAP schema parser. By sending crafted regex input, a remote authenticated attacker could exploit this vulnerability to cause a denial of service condition.","status":"published","published":"2022-06-18T15:27:17Z","modified":"2024-08-04T05:17:42.836Z","updated_at":"2026-11-02T14:33:02.930115Z"}],"euvd":[{"id":"EUVD-2022-6131","description":"python-ldap before 3.4.0 is vulnerable to a denial of service when ldap.schema is used for untrusted schema definitions, because of a regular expression denial of service (ReDoS) flaw in the LDAP schema parser. By sending crafted regex input, a remote authenticated attacker could exploit this vulnerability to cause a denial of service condition.","status":"published","published":"2022-06-18T15:27:17Z","modified":"2024-08-04T05:17:42Z","updated_at":"2026-11-03T03:08:22.448202Z"}],"ghsa":[{"id":"GHSA-qfr5-wjpw-q4c4","title":"Denial of Service in python-ldap","description":"python-ldap before 3.4.0 is vulnerable to a denial of service when ldap.schema is used for untrusted schema definitions, because of a regular expression denial of service (ReDoS) flaw in the LDAP schema parser. By sending crafted regex input, a remote authenticated attacker could exploit this vulnerability to cause a denial of service condition.","status":"published","published":"2022-06-19T00:00:21Z","modified":"2023-08-17T05:02:13Z","cvss":[{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","level":"medium"}],"cwes":["CWE-1333"],"updated_at":"2026-11-02T14:37:00.074932Z"},{"id":"GHSA-r8wq-qrxc-hmcm","title":"ReDoS in LDAP schema parser","description":"https://github.com/python-ldap/python-ldap/issues/424\n\n### Impact\nThe LDAP schema parser of python-ldap 3.3.1 and earlier are vulnerable to a regular expression denial-of-service attack. The issue affects clients that use ``ldap.schema`` package to parse LDAP schema definitions from an untrusted source.\n\n### Patches\nThe upcoming release of python-ldap 3.4.0 will contain a workaround to prevent ReDoS attacks. The schema parser refuses schema definitions with an excessive amount of backslashes.\n\n### Workarounds\nAs a workaround, users can check input for excessive amount of backslashes in schemas. More than a dozen backslashes per line are atypical.\n\n### References\n[CWE-1333](https://cwe.mitre.org/data/definitions/1333.html)\n\n### For more information\nIf you have any questions or comments about this advisory:\n* Open an issue in [python-ldap](https://github.com/python-ldap/python-ldap) tracker\n","status":"published","published":"2021-11-29T17:58:59Z","modified":"2023-01-09T05:05:30Z","cvss":[{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","level":"medium"}],"cwes":["CWE-1333"],"updated_at":"2026-11-02T14:36:11.367194Z"}],"nvd":[{"id":"CVE-2021-46823","description":"python-ldap before 3.4.0 is vulnerable to a denial of service when ldap.schema is used for untrusted schema definitions, because of a regular expression denial of service (ReDoS) flaw in the LDAP schema parser. By sending crafted regex input, a remote authenticated attacker could exploit this vulnerability to cause a denial of service condition.","status":"published","published":"2022-06-18T16:15:08.173Z","modified":"2026-06-17T04:15:37.16Z","cvss":[{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","level":"medium","assessor":"primary"},{"version":"2.0","score":4,"vector":"AV:N/AC:L/Au:S/C:N/I:N/A:P","level":"medium","assessor":"primary"}],"cwes":["CWE-1333"],"updated_at":"2026-11-02T14:07:06.501652Z"}],"osv":[{"id":"AZL-9960","title":"CVE-2021-46823 affecting package python-ldap for versions less than 3.4.0-1","description":"python-ldap before 3.4.0 is vulnerable to a denial of service when ldap.schema is used for untrusted schema definitions, because of a regular expression denial of service (ReDoS) flaw in the LDAP schema parser. By sending crafted regex input, a remote authenticated attacker could exploit this vulnerability to cause a denial of service condition.","status":"published","published":"2022-06-18T16:15:08Z","modified":"2026-04-21T04:35:11.780646Z","cvss":[{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","level":"medium"}],"updated_at":"2026-11-02T15:28:12.596039Z"},{"id":"CVE-2021-46823","description":"python-ldap before 3.4.0 is vulnerable to a denial of service when ldap.schema is used for untrusted schema definitions, because of a regular expression denial of service (ReDoS) flaw in the LDAP schema parser. By sending crafted regex input, a remote authenticated attacker could exploit this vulnerability to cause a denial of service condition.","status":"published","published":"2022-06-18T16:15:08.173Z","modified":"2026-10-20T10:55:12.304473874Z","cvss":[{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","level":"medium"}],"updated_at":"2026-11-02T15:44:22.18434Z"},{"id":"DEBIAN-CVE-2021-46823","description":"python-ldap before 3.4.0 is vulnerable to a denial of service when ldap.schema is used for untrusted schema definitions, because of a regular expression denial of service (ReDoS) flaw in the LDAP schema parser. By sending crafted regex input, a remote authenticated attacker could exploit this vulnerability to cause a denial of service condition.","status":"published","published":"2022-06-18T16:15:08.173Z","modified":"2026-10-23T18:05:16.947895376Z","cvss":[{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","level":"medium"}],"updated_at":"2026-11-02T15:45:35.799676Z"},{"id":"GHSA-qfr5-wjpw-q4c4","title":"Denial of Service in python-ldap","description":"python-ldap before 3.4.0 is vulnerable to a denial of service when ldap.schema is used for untrusted schema definitions, because of a regular expression denial of service (ReDoS) flaw in the LDAP schema parser. By sending crafted regex input, a remote authenticated attacker could exploit this vulnerability to cause a denial of service condition.","status":"published","published":"2022-06-19T00:00:21Z","modified":"2026-07-08T06:49:50.97565137Z","cvss":[{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","level":"medium"}],"cwes":["CWE-1333"],"updated_at":"2026-11-02T15:46:54.40888Z"},{"id":"GHSA-r8wq-qrxc-hmcm","title":"ReDoS in LDAP schema parser","description":"https://github.com/python-ldap/python-ldap/issues/424\n\n### Impact\nThe LDAP schema parser of python-ldap 3.3.1 and earlier are vulnerable to a regular expression denial-of-service attack. The issue affects clients that use ``ldap.schema`` package to parse LDAP schema definitions from an untrusted source.\n\n### Patches\nThe upcoming release of python-ldap 3.4.0 will contain a workaround to prevent ReDoS attacks. The schema parser refuses schema definitions with an excessive amount of backslashes.\n\n### Workarounds\nAs a workaround, users can check input for excessive amount of backslashes in schemas. More than a dozen backslashes per line are atypical.\n\n### References\n[CWE-1333](https://cwe.mitre.org/data/definitions/1333.html)\n\n### For more information\nIf you have any questions or comments about this advisory:\n* Open an issue in [python-ldap](https://github.com/python-ldap/python-ldap) tracker\n","status":"published","published":"2021-11-29T17:58:59Z","modified":"2026-07-08T06:49:50.97565137Z","cvss":[{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","level":"medium"}],"cwes":["CWE-1333"],"updated_at":"2026-11-02T15:46:55.480549Z"},{"id":"OESA-2022-1792","title":"python-ldap security update","description":"python-ldap provides an object-oriented API for working with LDAP within Python programs.  It allows access to LDAP directory servers by wrapping the OpenLDAP 2.x libraries, and contains modules for other LDAP-related tasks (including processing LDIF, LDAPURLs, LDAPv3 schema, etc.).\r\n\r\nSecurity Fix(es):\r\n\r\npython-ldap before 3.4.0 is vulnerable to a denial of service when ldap.schema is used for untrusted schema definitions, because of a regular expression denial of service (ReDoS) flaw in the LDAP schema parser. By sending crafted regex input, a remote authenticated attacker could exploit this vulnerability to cause a denial of service condition.(CVE-2021-46823)","status":"published","published":"2022-07-30T11:05:04Z","modified":"2026-08-18T01:16:52.972897409Z","cvss":[{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","level":"medium"}],"updated_at":"2026-11-02T15:52:39.528805Z"},{"id":"OESA-2022-1809","title":"python-ldap security update","description":"python-ldap provides an object-oriented API for working with LDAP within Python programs.  It allows access to LDAP directory servers by wrapping the OpenLDAP 2.x libraries, and contains modules for other LDAP-related tasks (including processing LDIF, LDAPURLs, LDAPv3 schema, etc.).\r\n\r\nSecurity Fix(es):\r\n\r\npython-ldap before 3.4.0 is vulnerable to a denial of service when ldap.schema is used for untrusted schema definitions, because of a regular expression denial of service (ReDoS) flaw in the LDAP schema parser. By sending crafted regex input, a remote authenticated attacker could exploit this vulnerability to cause a denial of service condition.(CVE-2021-46823)","status":"published","published":"2022-08-05T11:05:05Z","modified":"2026-08-18T01:17:10.627638379Z","cvss":[{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","level":"medium"}],"updated_at":"2026-11-02T15:52:39.528805Z"},{"id":"PYSEC-2026-912","title":"Denial of Service in python-ldap","description":"python-ldap before 3.4.0 is vulnerable to a denial of service when ldap.schema is used for untrusted schema definitions, because of a regular expression denial of service (ReDoS) flaw in the LDAP schema parser. By sending crafted regex input, a remote authenticated attacker could exploit this vulnerability to cause a denial of service condition.","status":"published","published":"2026-07-06T08:03:30.87595Z","modified":"2026-07-08T06:49:50.97565137Z","cvss":[{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","level":"medium"}],"updated_at":"2026-11-02T15:52:58.117212Z"},{"id":"UBUNTU-CVE-2021-46823","description":"python-ldap before 3.4.0 is vulnerable to a denial of service when ldap.schema is used for untrusted schema definitions, because of a regular expression denial of service (ReDoS) flaw in the LDAP schema parser. By sending crafted regex input, a remote authenticated attacker could exploit this vulnerability to cause a denial of service condition.","status":"published","published":"2022-06-18T16:15:00Z","modified":"2026-02-04T03:51:52.218542Z","cvss":[{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","level":"medium"}],"updated_at":"2026-11-02T15:54:30.277322Z"},{"id":"MGASA-2022-0310","title":"Updated python-ldap packages fix security vulnerability","description":"It was discovered that Python LDAP incorrectly handled certain regular\nexpressions. A remote attacker could possibly use this issue to cause a\ndenial of service (CVE-2021-46823).\n","status":"published","published":"2022-08-29T05:07:41Z","modified":"2026-04-16T04:43:37.661081402Z","updated_at":"2026-11-02T15:49:42.263076Z"},{"id":"USN-5508-1","title":"python-ldap vulnerability","description":"It was discovered that Python LDAP incorrectly handled certain regular expressions.\nAn remote attacker could possibly use this issue to cause a denial of service.\n","status":"published","published":"2022-07-11T14:09:05Z","modified":"2026-02-10T04:42:41Z","updated_at":"2026-11-02T16:58:16.20937Z"}]}}